Process for removing nitrogen oxides from waste gas
Patent 4029739 Issued on June 14, 1977. Estimated Expiration Date: 
June 14, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 14, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3615199 3843771 3888969 3904735 Method of removing nitrogen oxides from plant exhaust Process for removing nitrogen oxides from gas Method for purification of gas streams by removal of acidic gases Patent #: 3961018 InventorsAssigneeApplicationNo. 05/645350 filed on 12/30/1975US Classes:423/235, Nitrogen or nitrogenous component423/351, NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID)423/512.1Oxygen containingExaminersPrimary: Vertiz, O. R.Assistant: Wheelock, Eugene T. Attorney, Agent or FirmInternational ClassB01D 53/56 (20060101)Foreign Application Priority Data1975-01-06 JAAbstractNitrogen oxides can be efficiently removed from waste gas containing the same by oxidizing nitrogen monoxide into nitrogen dioxide, and then by scrubbing said waste gas with an aqueous scrubbing solution containing (a) a sulfur-containing reducing compound of alkali metals or ammonium such as alkali or ammonium sulfites, thiosulfates, sulfides, polysulfides and hydrosulfites and (b) a catalytic compound such as amino compounds, nitro compounds and oxidation or reduction derivatives thereof.Other References
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